Muffler arrangement for multicylinder internal-combustion engines.



1f c. Mmmx 4 n MULICYHNDER iNTEBNAL COMBUSTIONENGINESL MUFFLEB ARRANGEMENT .FOR

APPLICATION FLE APR. 13, 1912.

Patented Aug. 29, 1916.

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lb all whom t may concern:k

lie it known that' I, 'Joux C. Moons, a' citizen' of the ,United States-residing at Connersville, iny thecounty of Fayette', and

,State of Indiana, have invented anew and useful Muiier Arrangement for Muiticylin- 4 der Internal-Conibustif'in- Engines, of which Athe following is a specification. f

- lilly-.invention relates to multi-cylinder internal combustion vengines with muiiedex- I rIl ha`,vefoi.incilA thatv when the exhaustsot` the' various cylinders` ot' a multi-cylii'ider internal combustion engine arev connectedf incommon to the saine inidrler, there is a 'dilution of the explosive mixture in the en,

gine,l cylindersy by burnt gases which' are foi-'ceder held back in suclrcylimlers. This isdue to the vfact that the exhaust ports of the'cyl-inders are openv for more than 180ov of crank shaft movement,'so that at the opening,r of the exhaust ports for cach cylinder two or more`cylinders are connected through the exhaust manifold. ()n account of the resistanceo the muliler, the pressure ofthe exhaust just ,beginning forces or holds theyhurnt lgases back in the ycylinder from ivhichthe exhaust is nearly complete-tl. According to my invention, this dilutionaitf the explosive mixture isprevented by the use otl a plurality ot'- mulliers, two usually being siiiiieient. 'lhese mulllers are connectcd to thel engine cylindcrsiso that successively' exhaustingr cylindersexhaust through ditlierent'inulilers. l

The variousaiovel t'eaturesot' my inven-l tiorn will. appear from' the description and.

drawings and will he particularly pointed volitin the claims.

In"the drawings; 'Figure is a semi-diao grammatio view of ir six cylinder engneex' haustingr through two miifflers in'accordance .with'my inventio;,l*`ig. 2 is a diagrammatic vertical cross-section through such an engine f i415V movement. t

,The six' cylinders of the` engine lrexhaust` as shown in'Fignwl; and Fig. 3 is a diagram@ showing the relationbetweenthe working. stroke, ther exhaust, and the'v crank shaft in 'any' desired'sequence, it being' assumed Specification of Letters Patent.

lcss than 240" degrees; j

`not force or hold the burnt gases back "in,

PATENT jMii'slijten ARRANGEMENT :son MULTICYLINDERINTERNAL-COMBUSTON misintesi. v

Patented Aug.` 29, 1916.?l-

Apiaiea'qqioay fiieaiAprn 13, 1912.v serialk No. 690,437.-

i 'herein that the sequence is the usuali one,`f

ternately exhausting .cylinders connected to a separate exhaust manifoldand muliler, the cylinders l. 2, and 3 'being connected to the'exhaust manifoldll and through it` tothe muil'lerv 12,` andthe cylinders 4,5.:'in`d'f 6 beingconnccted to' thc exhaust manifold.

13 `and through it to theinullier 14.'. shown in' Fig'. 3, the usual working stroke ot' the piston 20'in cach cyhnderis substai`itially i350 of 'themovementof the crank.- sliat't2-l` the working` stroke being colnl'ilcted' A before the completion of the down stroke. ot" L the piston. 'working' stroke, "the yexhaust valves are llpon the 'completion ol' the' opened so that the burnt'gases in the c vlinf': dei" may escape into the mullier, the exhaust;y valves remaining'open untilthe pistonflias reachcd thc. end ot' its down stroke andly has, made the complete rup stroke, and

usually until it has started again on its "t" down stroke, or about 235 ot thcinovenient i of the crank shaft. ln the six cylinder en- 'n gine connected as shown.y where successively exl-iansting cylindershave their pistons back 'in the cylinderl next previously exhausting. Because the exhaust valves are open for less than twice .the anglel of pacing of the pistons on ythe crank sha-ft, no l two cylinders are open `to the same exhaust i mahifold at the same time, so that the' presi" sure from the exhaust otono cylinder can-` the' second previously exhaustingr cylinder.

JThus dilution of. thel explosive mixture is completely prevented.

While l haveV shown my invention as applied to a. cylinder engine of the four .100",VVV

cycle type, it may be applied to engines of other types and with a greater or less number of cylinders. I, therefore aim to cover all modifications which do not involve a departure from the spirit and scope of my involition, as set i'orth in the following claims.

What l claim as new is:

l. In. combination, a multi-cylinder interna] combustion engine having more than 'two cylinders and in which the exhaust periods of successively exhausting cylinders overlap, a plurality of independent muflers less in number than the number of cylinders of the engine, said mulliers'having separate discharge ,openings tothe atmosphere, and

connections between the exhausts ofthe sev# eral engine, cylinders and the muiilers Where- "by successively exhausting cylinders are con-- neeted to different mulllers. i

2. In combination, a multi-cylinder'in' ternal combustion engine having a composite number of cylinders and in which the exhaust periods of successively exhausting cyl? inders overlap, a plurality of independent muillers the `number of which is an aliquot part ot' the number of engine cylinders, said nn'iers having separate discharge openings to the atmosphere, and connections between i cach muiller and a plurality of, but less than all of, the engine cylinders,'successively exhausting cylinders being connected to dii'ernut mufllers. i

Il. ln combination, a multi-cylinder internal coinlnistion engine having more than two cylinders and in which the exhaust periods of successively exhausting cylinders over lap, two independent nuullershaving sepa rat-e discharge openings to the atmosphere,

and connections between each mulller and alternately exhausting cylinders of the engine. l. ln ccnubination, a sixcylinder internal combustion engine, and two irulependent iuulllers respectively connected to the exhaust sides of allcri'iately discharging cylinders of said engine. having separate discharge openings to the atmosphere.

3. lacoinbiinition, a puliti-cylinder inter-` nal combustion engine having more than two cylindersl and in which the periods oi opening of the exhaust valves oi a plurality of rylindcrsoverlap, a plurality ol' independent uiulllers less in number than the number of cylinders of thc engine, said niulllers havingr of others, a plurality of independent con duits havingseparate discharge openings to;

the atmosphere, eachconduit being connected to the exhaust ports of cylinders whose exhaust `periods do not overlap at anytime.

7. In colnbinatioina multi-cylinder inter# nal combustion engine having more than two cylinders and in which successively exhaust` ing cylinders have exhaust strokes overlapping in time, .a plurality of independent mulilers less innulnber than 'the number of cylinders of the engine and as great in` number as the greatest number of cylinders whiclr are exhausting at any one ti1ne aid mullers having separate discharge openings to' the, atmosphere, and. connections between the exhausts Vof the several engine cylinders exhaust strokes overlap 1n time are connect-` ed to different muiiler c 8, Incomhmatlon, a multl-cyllnder 1nteri nal combustion engine having more than two cylinders and in which the exhaust periods of successively exhaustlng cyhnders overlap,

lso

4and the muillers whereby cylinders whose i a plurality of independent muilers less 1n' i number-than the number of cylinders of the engine, said mulilers having separate discharge openings to the atmosphere, andcon nections between each mufliery and apluralf ity of, but less than all of, the engine cylinders, successively exhausting-.cylinders being connected to dilferent muillers.

9. an internal combustion engine having a pluralityof cylinders and arranged so that one cylindershall exhaust before the other has completed its exhaust stroke, a passage communicating with the exhaust ports of a part of said cylinders, a passage-com-l municating with the exhaust ports of the rest oi said cylinders, said cylinders being varranged to exhaust'into'sald passages'so that the cylinders exhausting at the saine time shall exhaust into different passages, Y

charge openings to the atmosphere.

` 410. In an internal combustion engine i hav`- ing a plurality of cylinders any one ot' which exhausts during theexhaust stroke of some other of saul cyl1nders,a plurality of pas sages which communicate with the exhaust' ports of different said cylinders, said cylinders being arranged to exhaust into said passages so that the cylinders exhausting' at the. saine time shall exhaust iinto different passages, and said passages having separateI outlets to the atmosphere.-

ll; ln an internal combustion engincha-ving a 'pluralityof cylinders any one of which exhausts during the exhaust stroke ot' sonic sages which communicatewitlrthc exhaust ports of dill'ercnt cylinders, said cylinders so that the exhaust p'orts ofany cylinder and said two passages having separate dis- -other of said cylinders, a plurality of `pa`s bring arranged to exhaust into said passages ,connected with yalnly one v of said passges this Qthvdey of pljl, D. one fhoxsand` .shall be open only when the exhaust ports ninehundred and! twelve.

ofL-all other cylinders connected Qwththe l JOHN C MOOR ["Ls'j same passage are closed,- and said passages having sepate outlets to' the atmosphere. `Wilnlesses:

'In witness whereof, I have hegeunt'p set',l v. HARRY S. JoHNsoN,l my hand.l and seal at Connersville,Indinelay. F'lgnpnmc I. Bmuzows.u 

